Drilling-machine.



J. ZINK.

DRILLING MACHINE.

APPLICATION man FEB. 6. 1918.

Patented Feb. 11, 1919.

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INVENTQR 2225:

vvsmessss N. W 02m ATTOR N EY.

JOHN ZINK, 0F TERRE HAUTE, INDIANA.

DRILLING-MACHINE.

' teeters.

To all whom it may concern:

Be it known that I, J OHN ZINK, a citizen of the United States, residingat Terre Haute, in the county" of Vigo and State of Indiana, haveinvented certain new and useful Improvements in Drilling-Machines, ofwhich the following is a specification.

This invention relates to drilling machines, and more particularly to amachine which is especially. adapted for mining coal and similarpurposes. I

One of the main objects of the invention is to provide a machine of thecharacter stated of simple construction and operation which may bereadily operated manually. A further object is to provide a drillingmachine comprising a rigid supporting frame and a carriage or innerframe slida-ble therein which carries the drilling mechanism, simple andeflicient means being provided for securing this carriage in verticaladjustment. A further object is to provide a main bit having a centerborer secured therein and of less diameter than the main bit, reamersbeing provided at the inner end of the main bit and serving to enlargethe hole made by the center borer, the main bit itself constituting ascrew feed for removing the material from the hole being. bored. Furtherobjects will appear from the detailed description.

In the drawings:

Figure 1 is a back view of a drilling machine constructedin accordancewith my invention.

Fig. 2 is a side view.

Fig. 3 is a transverse section taken on a plane above the drive gearing,looking down, this section being taken substantially on line 33 of Fig.2. Fig. 4 is a section taken substantially on line H of Fig. 2.

I Fig. 5 is a similar section taken on line 5 5 of Fig. 1. i

Fig. 6 is a detail end view of the main drilling bit.

The main supportin frame A is ofsubstantially rectangular shape havingthe end bars 1 and 2 and the side bars 3 and 4. A securing pin 5 isslidably mounted through bar 1 at the center thereof, and is secured inadjustment by means of the eye-bolt 6 which may be threaded into tightengagement therewith by a suitable instrument which is inserted throughthe eye of the bolt. A similar pin 7 is inserted through Specificationof Letters Patent.

Application filed February 6, 1918.

Patented Feb. 11, 1919.

Serial No. 215,682.

the lower end bar 2 and is secured in adjustment therein by an eye bolt8. These plns serve to secure the main supporting frame in position inthe room in which the machine is being used, the upper pin 5 en gaginginto the ceiling and the lower pin 7 engaging into the floor of the roomin the well-known manner. A rectangular frame or carriage B' fits snuglyinframe A and is slidablelongitudinally thereof. The upper end bar 9 ofthis carriage is provided with heavy guide straps 10 which fit snuglyabout the adjacent side bar of the main frame and serve to guide thecarriage during its movement in the main frame. Similar guide straps 11are provided at each end of the lower end bar 12 of the carriage andalso engaged about the side bars of main frame A. Adjusting bolts 13 arethreaded through the outer bars of straps 10 and cooperate with similarbolts 14L threaded through the outer bars of straps 11, to secure thecarriage in vertical adjustment in the frame. By this means, thecarriage and the drilling mechanism carried thereby may be readilysecured in any desired vertical adjustment within the main frame.

A shaft 15 is rotatably mounted in bearing blocks 16 secured to the rearedges of the side bars of carriage B. This shaft is secured againstaXial movement by means of a collar 17 secured thereon and engaging theinner face of one of the bearing blocks 16 and by the hub 18 of the gearwheel 19 keyed on the shaft, this hub engaging the inner face of theother bearing block. The shaft is squared at each end, as at 20, toreceive the socket 21 of an operating crank 22 for manually rotating theshaft. Gear 19 meshes with a pinion 23 secured on a. shaft 24 Which isrotatably supported in bearing blocks 25 above shaft 15. Suitablecollars 26 are secured on shaft 24 adjacent the outer faces of thebearing blocks and serve to prevent axial movement of this shaft. Thesecollars are secured in position by means of set screws for a purpose tobe later disclosed. Pinion 23 is provided, on its inner face, with aninwardly directed beveled gear 27. This gear meshes with a beveled gear28 secured on a stub shaft 29 rotatably mounted in a cross-piece 30carried by the inner frame or carriage B. This tub shaft is normallysecured against axial movement by a collar 31 secured on the outer endthereof and cooperating with the hub of gear 28 in the the spur gear 35may be rotated at relatively high speed by means of the crank 22, thisoperation of the gear wheel 35 being facili tated by the fly wheel 37.If desired, the set screws for securing the collars 26 on'shaft 24 maybe loosened and the fly wheel 37 be removed from this shaft, the shaftbeing slid through the bearing blocks 25 and the fly wheel placed on theother end thereof, after which the crank 22 may be placed on the otherend of shaft 15 to that illustrated. By this means, the machine may bequickly and easily adjusted so as to be operated from either sidedesired. V

Spur gear is centrally bored to receive a screw-feed rod 38 slidablethrough the gear. This rod is provided with a groove 39 which receives arib or feather 40 formed on the inner surface of the hub of the gear,the feed rod bein slidably connected to the gear so as to rotatetherewith and move axially in dependently of the gear. A seotionalfeednut indicated generally by 40 is secured to the front face of the crossbar 36. This nut is disposed in axial alinement with the gear 35 and iscomposed of an upper fixed section and a lower hinged section which maybe forced toward the fixed section by means of wedges forced beneath thepin carried by the lower section and an arm carried by the bar so as toclose the nut, or in any other suitable manner. This nut is interiorlythreaded, the thread of the nut corresponding with the thread of feedrod 38, so that when the gear 35 is rotated, rod -38 will be rotated andwill besimultaneously fed through the nut 40. It will be understood, ofcourse, that any other suitable form of nut than that illustrated may beemployed. A main drill bit 41 issecured in the for ward end of rod 38.This main bit is provided in its forward end portion, with an axial borewhich receives the socket portion of a center borer 42. A set screw 43serves to secure this center borer detachably in the outer end of mainbit 41. Bit 41 is further provided, adjacent its outer end, with reamingmembers 44 which are secured by means of set screws in suitable socketsin thebit. These reaming members are disposed at a forward angle to thebit and project radially thereof, the function of members 44 being tocut out or enlarge the entering hole or bore made by the center borer42. The machine is set up adjacent the fall of the coal to be mined inthe usual manner, after which the main bit 41, and consequently thecenter borer 42, are rotated by means of the crank 22. The center borer42 acts to form the initial bore or opening and, during its rotation, isfed forwardly into the coal. The center borer is followed by the reamers44 which act to cut out or enlarge the opening formed by borer 42. Thereamers are followed by the main bit 41 which acts in the manner of ascrew conveyer to remove the cut coal from the borer, thus insuring aclean and uniform. out and ease of operation of the machine. Byproviding the center borer 42 and the reamers 44 in conjunction with themain bit 41 which serves to remove the slack the bore may be formed byfirst cutting a comparatively small opening which is then enlarged tothe size desired, thus greatly facilitating the operation and renderingit possible to bore a hole with the application of but comparativelysmall ower.

WVhat is claimed is In a drilling machine, a supporting frame providedwith two spaced parallel side bars, a carriage slidably mounted forvertical movement on said side bars and fitting snugly between the same,means for securing the carriage in vertical adjustment, a drill shaftrotatably supported by the carriage at the transverse center thereof, adrive shaft rotatably supported by said carriage and mounteddirectly onthe rear face thereof, a shaft rotatably mounted directly on therearward face of the carriage in vere tical alinement with said driveshaft, driving connections between the two said shafts, and drivingconnections between said drill shaft and the shaft mounted above thedrive shaft for rotating said drill shaft, all of said shafts beingsupported by'the carriage in superposed spaced relation so as toeliminate all tendency to tilt the carriage so as to cause bindingthereof'on the supporting frame.

In testimony whereof I affix my signature in presence of two witnesses.

JOHN ZINK.

\Vitnesses:

FRANKLIN YOUNG, TILLYE BABILms.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, D. C.

